Electric-arc lamp.



Nb. 635,740. Patented ont. 3|, |899. s. BERGMANN.

ELECTRIC ARC LAMP.

(Application filed Nov. 25, 1898.)

2 Sheefs-Sheet l,

(No Model.)

Patented Oct. 3|, i899. S. BERGMANN. ELECTRIC ARC LAMP.

(Application led Nov. 25, 1898.)

2 sheets-sheet 2.

(No Model.)

fg l

ks /l/ UNITED STATES PATENT muon.

SIGMUND BERGMANN, OF NEIV YORK, N. Y., ASSIGNOR TO THE GENERAL INOANDESOENT ARO LIGI'IT COMPANY, OF NElV YORK.

ELECTRlC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 635,740, dated October 31, 1899.

Application filed November Z5, 1898. Serial No. 697,308. (No model.)

To all whom, it may concern:

Beit known that I, SIGMUND BERGMANN, a citizen of the United States, residing` at New York city, county and State of New York, have invented certain new and useful Improvements in Electric-Arc Lamps, of which the following is a specification.

My invention relates to a device by means of which a permanent but elastic electrical ro connection is interposed between the frame of the lamp and the upper-carbon holder.

My invention further relates to various details of construction which will be described and then fully pointed out in the claims.

The object of my invention is to improve the operative features of an electric-arc lamp.

The accompanying two sheets of drawings will serve to illustrate my invention and in which similar numerals indicate like parts.

2o Figure 1 is an elevation of a side view of my improved lamp, showing the carbonholder and directing-tube in section above and below the magnet. Fig. 2 is a front elevation and partial section of the upper-carbon holder. Fig. 3is atransverse section of the directing-tube and carbon-holder on the line X X of Fig. 1. Fig. 4t is a similar view of the carbon-holder, taken on the same line. Fig. 5 is a transverse section of the directing- 3o tube, carbon-holder, and carbon on the line Y Y of Fig. 1. Fig. 6 is a similar view of the carbon-holder and carbon, taken on the line Y Y of Fig. 1. Figs. 7 and 8 are transverse sections of the directing-tube and carbonholder, taken, respectively, on the lines S S and R R of Fig. 1. Fig. 9 is a vertical section of the directing-tube and carbon-holder and showing a modified form of carbonholder. Fig. 10 is an elevation and partial 4o vertical section of the lower portion of the lamp, taken one-quarter around from the position shown in Fig. 1. Fig. 11 is a vertical section of the support for the globe and lower carbon with the globe removed. Fig. 12 is 4 5 a transverse section of the carbon-holder,

taken on the line T T of Fig. 9.

In the drawings, 1 represents a solenoidal magnet connected to the suspending-plate 2 by the inclosing tube 3. Depending from the 5o magnet are the rods 4 at, which carry the plate 5, and located centrally through an opening in this plate is the tube G, supported at 7 by the cross-piece 3 at the top of the magnet. Depending from the plate 5 are the rods 9 9, which support the plate 10, which carries the gas-cap 11, such as is usual in lamps employing an inner arc-inclosing globe.

12, Fig. 1, represents the armature of the solenoid, and 12, Figs. l and 10, the clutch mechanism, which controls the movement of 6o the upper carbon.

Located within the tube 6 is a directingtube 13, and situated within this tube and adapted to move freely therein is a carbonholder 14, which carries the upper carbon 15. Two forms of carbon-holder are shown. That in Fig. 2 is cylindrical in cross-section and that in Fig. 9 hexagonal in cross-section.

The object of making the carbon-holder of less diameter than the directing-tube, or hex- 7o agonalincross-section,is to provideforfacility of movement of the carbon-holder Within the directing-tube irrespective of whether or not the surface of the directing-tube has become roughened under the influence of heat or by 75 the deposit of any substance.

The directing-tubes differ in Figs. 2 and 9. In Fig. 2 the directing-tube 13 has a slot 1G formed longitudinally along one side, and in this slot there is located, so as to be freely 8o movable along the slot, a block 17, which is secured to the carbon-holder 14E and to a loose ring 13, located on the outside of the tube 13, by the screws 19 or other equivalent means. The object of this construction is to guide the carbon-holder 1-1 and also prevent its turning in the tube. Secured to the top of the tube 13 is a cap 20, and wound around the tube under the cap and above the ring 1S is ametallic cord 21, permanently secured at one end 9o to the cap and at the other end to the ring 13. In the construction shown in Fig. 9 the tube 6 is dispensed with, and instead of winding the metallic cord around the outside of the directing-tube 13 it is located Within the di- 95 recting-tube 13 and permanently connected to the cap at one end and tothe carbon-holder at the other end instead of through the instrumentality of the ring 13, as in Fig. 2.

The metallic cord 21 may be made of any roo suitable material which will serve to convey the current designed to operate the lamp. It

may consist of a single wire or a number of wires twisted or braided together. In practice the metallic cord is given such a length as will be ample to permit the carbon-holder to move freely in the directing-tube.

In Fig. 2 of the drawings the directing-tube 13 is in metallic connection with the tube (i, which latter is in metallic connection through the frame of the lamp with the source of energy. In Fig. 9 it is assumed that the directingtube 13 is in metallic connection, although by reason of the ligure being only a portion of the construction such connection is not shown. In both figures the metallic cord serves to convey the current from the source of energy to the carbon-holder. It will be understood that as the cord is flexible and of sufficient length it will follow the carbon-holder throughout its whole range of ymovement in either direction, and thereby maintain a permanent electrical connection and avoid one of the most frequent sources of difficulty in electric-arc lamps-namely, an imperfect electrical connection between the upper carbon and the source of energy.

22 23, Fig. l0, are rods depending from the plate 10 and supporting the block 24, perforated at 24 to permit of the introduction of the lower carbon 25, which is secured in position by the screw 2G. rlhe lower portion of the block 24 is provided with an exterior screw-thread 27, and on this is secured, by means of a screw-thread on its interior 28, the cap 29. This cap is formed of the dish 30 and bottom portion 3l. The dish 30 is shaped on its exterior to coliform to the inner surface of the globe 32 near its bottom. The outer surface of the lower portion of the cap 29 is screw-threaded, as at 33, and on this is secured the ring 34, which is composed of the annular ring 35 and cylindrical threaded portion 36. Located in the cavity of the annular portion 35 of the ring 34 is a portion of asbestos 37, which lies under the lower edge of the globe 32. A similar portion of asbestos 38 is arranged over the top of the globe and between it and the plate lO.

The dotted lines in Fig. l0 show the globe partially removed for trimming the lamp. To accomplish this, the dished ring 34 is rotated until it leaves the screw-thread 33, which permits tb e globe to descend. When the globe is in the position shown in the full lines, it is not only supported by the ring 34, but has its lower portion sealed by the dish 30. The bottom portion 3l of the ring 29 seals the opening 24 of the block 24.

The operation of the lamp will be readily understood by those skilled in the art without entering into any det-ail description.

I am aware that a iiexible electric connection has been interposed between the frame of the lamp and the carbon-holder, and such l do not claim, broadly, as my invention.

Having therefore described my invention, what I claim isl. In an electric-arc lamp and in combination with a slotted directing-tube, of a carbon-holder included within the tube, a ring surrounding the directing-tube and connected with the carbon-holder through a pin which moves in the slot of the directing-tube, and a conductor of electricity wound helically around the directing-tube and connected at one end to the tube and at the other end to the ring.

2. In an electric-arc lamp, and in combination with the supporting-plate for the lower portion of the lamp, of depending rods, a threaded block on the end of said rods, a threaded cap provided with a dish portion, an inner arc-inclosing globe, the inside of the lower portion of which conforms to the shape of the exterior of the dish, and a threaded ring having an annular portion in which the bottom of the arc-inelosing globe rests.

3. In an electric-arc lamp, and in combinan tion with a perforated block for supporting the lower carbon, a cap taking over said block and provided with a dish portion and cylindrical threaded portion, which latter takes over and seals the perforation in said block, an are-inelosing globe, and a ring provided with an annular portion and a cylindrical threaded portion which takes over the threaded portion of said cap.

4. In an electric-arc lamp, and in combination with the threaded block for supporting the lower carbon, of a cap provided with a dish portion and a threaded cylindrical portion, an arc-inclosing globe, a ring provided with an annular portion, -a threaded cylindrical portion, and a ring of non-conducting material located in said annular portion and below the lower edge of the inclosing globe.

5. In an electric-arc lamp, and in combination with the plate for supporting the lower portion of the lamp, a block for supporting the lower carbon, a cap provided with a dish portion and threaded cylindrical portion, an arc-inclosing globe, a ring provided with an annular portion and threaded cylind ri cal portion, and rings of non-conducting material located respectively under the supportingplate and in the annular portion and above and below the upper and lower edges of thc arc-inclosing globe.

In testimony whereof I affix my signature in the presence of two witnesses.

SIGMUND BERGMANN.

lVitnesses:

P. Il. KLEIN, J r., l. WERTHEIMER.

IOO

IIC 

